My Maxsun B850ITX WIFI ICE keeps dropping frames during intense combat in Granblue Fantasy, how do I fix this?

The frame rate tanking during peak combat was jarring. I only realized what was happening when I saw my CPU clock plummet from 5.2GHz to 3.0GHz—classic thermal throttling. Because the traces on this Maxsun ITX board are so cramped, the VRM heatsinks were hitting 98-105℃ during heavy particle effects, triggering the board's protection limit. I tried capping the CPU TDP to 65W in the BIOS; while temps dropped to 80℃, game load times slowed by 20%, which was a total dealbreaker for me. My actual fix was rigging a 40mm spot fan to blow directly onto the VRM modules and setting a manual voltage offset of -0.05V to cut down the heat. Monitoring with HWInfo, the VRM temps now hover between 75-82℃, and the clock speeds no longer crater. I did have a scare where the SSD wasn't detected twice because of cable interference from the new fan, but a quick cable manage fixed it. CPU temps are sitting at 68-74℃. After a 3-hour stress test, the throttling is gone.